{"title":"DFRobot ST3215 12V Serial Bus Servo - 30kg.cm, 360° Encoder","handle":"st3215-serial-bus-servo-12v-30kg-360-magnetic-encoder","url":"/products/st3215-serial-bus-servo-12v-30kg-360-magnetic-encoder","description":"The ST3215 is an intelligent serial bus servo for robotics and automation projects that need strong torque, position feedback and tidy wiring. It runs from a rated 12V supply and delivers 30kg.cm stall torque through a coreless motor and metal gear train.A 12-bit magnetic encoder provides 360° absolute position feedback, with 4096 steps and 0.088° resolution. Because it uses non-contact sensing rather than a traditional potentiometer, it is designed for longer service life and repeatable positioning.Control is via a TTL-level, half-duplex UART serial bus, allowing up to 253 servos to be daisy-chained from a single port. The bus also returns real-time feedback including position, speed, load, voltage and temperature, which is useful for closed-loop robotic systems.In the box you get the ST3215 Serial Bus Servo-12V 30kg 360° ×1, a servo horn screw accessory kit ×1 and a 3-pin servo cable ×1. A 2D dimension document is also provided by the supplier.Features:360° high-precision magnetic encoder: 12-bit absolute position feedback over a full 360° range.4096-step resolution: Control accuracy of 0.088°.Non-contact sensing: Eliminates physical wear compared with traditional potentiometers.One-click midpoint calibration: Set any position within the 360° range as the new centre point.High torque: 30kg.cm stall torque for demanding loads.Durable gear design: 1:345 gear train constructed from copper and aluminium.Robust housing: PA+GF casing for reliability and longevity.Angle Servo Mode: Precise 0-360° absolute positioning with configurable acceleration and deceleration.Speed Closed-loop Motor Mode: Functions as a DC motor while maintaining constant speed under changing load.Speed Open-loop Motor Mode: Functions as a standard DC motor where speed is proportional to voltage and decreases under load.Stepping Mode: Incremental motion from the current position with continuous rotation support.TTL-level UART serial bus: Half-duplex protocol for simplified multi-servo wiring.Daisy-chain support: Up to 253 servos on a single port.Bi-directional communication: Real-time feedback for position, speed, load, voltage and temperature.Configurable acceleration start/stop: Smoother motion profile with reduced mechanical shock.Electronic protections: Built-in overload, overcurrent, overvoltage and overheating protection.Specifications:Rated working voltage: 12VNo-load speed: 0.222s/60° (45RPM)No-load current: 180mAStall torque: 30kg.cm/417.35oz.inStall current: 2.7AStandby current: 30mAOperating voltage: 4-14VRated load: 10kg.cmRated current: 900mAMotor resistance: 1ΩTorque constant (Kt): 11kg.cm/ADimensions: 45.2×24.7×35mmHousing: PA+GFGear material: CopperBearing: Ball bearingSensor: 12-bit magnetic encoderRotation: 360°Connector: 3-pin (Black-GND, Red-VCC, Blue-Signal/TTL)Cable length: 15cmWeight: 55±1gOutput shaft: 25T/OD5.9mmGear ratio: 1:345Gear backlash: ≤0.5°Output shaft screw: M3×6Motor type: CorelessSignal: DigitalProtocol: Half-duplex UART (8-bit, 1 stop bit, no parity)ID range: 0-253Baud rate: 38.4kbps-1Mbps (default: 1Mbps)Control algorithm: PIDMidpoint: 180° (2048 steps)Resolution: 0.088°Rotation direction: Clockwise (0→4096)Feedback: Load, position, operating speed, input voltage, operating current, operating temperatureElectronic Protection: Overload, overcurrent, overvoltage, overheatOverload: Triggers when stalled torque exceeds 80% of stall value for 2s; cleared by sending new position command. Customizable torque threshold/duration.Overcurrent: Disables output when current >2A for 2s; cleared by sending new position command. Customizable current threshold/duration.Overvoltage: Activates when voltage >7.4V or ＜4V; auto-recovery within normal range. Customizable voltage range.Overheat: Disables torque output when temperature >70°C.Operating Modes: Mode 0, Mode 1, Mode 2, Mode 3Mode 0: Angle Servo (default; 0-360° absolute positioning)Mode 1: Speed Closed-loop Motor (maintains speed under load)Mode 2: Speed Open-loop Motor (speed drops under load)Mode 3: Stepping Mode (incremental motion from current position)Multi-Turn Mode: ±7-turn absolute positioning at maximum precision (turn count not saved after power loss).Center Calibration: One-click midpoint setting at any 360° position.Load lifespan: >100,000 cyclesMotor noise: 45±5dBServo noise: 65±5dBStorage temp: -30°C to +80°COperating temp: -10°C to +60°CMax update rate: 1msHigh-level voltage: 2-5VLow-level voltage: 0-0.45VSuited to robotic arms, educational robots, quadruped robots, humanoid robots and small-scale sorting systems.","vendor":"DFRobot","product_type":"Serial Bus Servo","in_stock":true,"options":[],"variants":[{"id":15955,"title":"Default Title","sku":"DF-SER0070","mpn":"SER0070","price":48.95,"on_sale":false,"in_stock":true,"available_quantity":166}]}